Malicious PDF — malware analysis report

Static analysis result for SHA-256 c525116b470a1848…

MALICIOUS

PDF

81.8 KB Created: 2021-09-23 20:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71de2f41582abee634fe76bd05f93875 SHA-1: b7764f2088ff773e48da89ca8fc52184729d4bf9 SHA-256: c525116b470a1848220785e0a21b2a08720460906df344bcb3c83280156b6224
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious or unwanted content, likely for phishing or malware distribution. The presence of external URI indicators and the link farm heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=clean+master+for+android+free+download+apk
    • https://xn--interpeas-r6a.es/upload/files/josinidodumi.pdf
    • https://meganimal.pt/site/upload/file/ziwajufibaku.pdf
    • https://civilkontroll.hu/uploads/file/30110724684.pdf
    • https://debcopharma.com/userfiles/file/sawekepofegijekizevojuken.pdf
    • http://abnicum.com/files/file/rekofelisalofafuj.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/2e68fcb3b88fd057b2f4040fe78b8585/72988746569.pdf
    • http://kozelskadm.ru/files/uploads/files/83954465899.pdf
    • https://mkontakt.pl/dat/file/najupube.pdf
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/7169797968.pdf
    • http://soepcentrale-dekeyser.be/userfiles/file/95342159768.pdf
    • https://spyboarcams.com/files/9344262952.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130671e61d2c---84986872990.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/nopajasitepa.pdf
    • https://questyme.ca/userfiles/file/18103452297.pdf
    • http://chikatere.com/Upload/files/3296686868.pdf
    • http://vinaktv.com/storage/ckfinder/files/nevimedadeliz.pdf
    • https://bnbcostaverde.it/userfiles/file/13892618412.pdf
    • http://sfipl.in/userfiles/file/62509437819.pdf
    • http://lesmashclub.com/imgUpload/files/98743201487.pdf
    • https://natatourism.com/userfiles/files/41592022264.pdf
    • http://ecohort.com/userfiles/files/novik.pdf
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/gelarexodolojexe.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/64129264930.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d916.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD916 16792 bytes
font_01_sfnt_off0000f128.bin
970b481d07d256e55276dc03d2237f5b5fceb12ac090af11a5479429b3bc6a5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 18140 bytes
font_02_sfnt_off00012026.bin
c1837a293801c9d6404a871160eb7a115a4b219c3aa99d51da55304c35c1936c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12026 10868 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.